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Level 30 - RSSETIS
The answer to this puzzle is:
Words: RESISTS, RESITS, TRIES, TIERS, STIRS, STIES, SISES, SIRES, RITES, RISES, RESIT, RESTS, TRESS, RISE, TRES, TIES, REIS, SITS, SIRS, RITE, SETS, SEIS, SIRE, ERST, SIS, RES, SER, ITS, IRE
Bonus words:
RESISTS, RESITS, TRIES, TIERS, STIRS, STIES, SISES, SIRES, RITES, RISES, RESIT, RESTS, TRESS, RISE, TRES, TIES, REIS, SITS, SIRS, RITE, SETS, SEIS, SIRE, ERST, SIS, RES, SER, ITS, IRE